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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f049cb8dc45282c55e0ef49cde59c3e8758dc84b49686253c5038f922bec72ec' 
  AND token = 'e9aJ1BK9e8w2gVKAooUy5e39ao8s3chbikEg/tAXfX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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