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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd545bcc63d1a39015bf7e130ddf1c031c230bf293ca71031350fa2f5324afdb0' 
  AND token = 'OMEz95HDLeInfb9AnOe6f+a8fTJ18ULzqJkVwO5gmwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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