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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b900d190f249cd4d3e80a72891ebe35705e75476a10120e9720c3be2dffa6e' 
  AND token = 'gS1q+umX2gSRrVF4Dce7nXBou2G+jjXJUmxLFPsVNPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}