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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c334c0d79f91a09dba9f3424c526fe37c5617f5b95c0e97b0e90b0170f81b083' 
  AND token = 'qNqqXI47wvnSnFXnEpMuykWPG8nSHqp+x62X15dmV5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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