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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d00a7d4c9a2d552d43067553048d8d55410c2587b373ce7206c18b56a7c7dc0' 
  AND token = 'zM3QRT4aYlj2ixdc3Zy37YElaFUwEBB85C8nnjqrsh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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