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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07f585374303fe3507664964022d7814dd8cc79d604f3e3bbbb6e92422929d5' 
  AND token = '654AsqA8H0SQy+1g3p9IZmSBY/VeMhw4Id4ok5e1ULg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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