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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0342a8f4c1af1c6439d7a1a9fd34ed60028d2f51de8a412993dd4d77ba3f7125' 
  AND token = 'uHvNhevXXUUg4yvAyOznm/Pj94lnuhGZWPS8A8u6FMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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