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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2364c127a95d953fd42fd1c3d22c4297e06c14078bed52e0b5f4a152deb1eb57' 
  AND token = '0rKloj580SwAiZwUTPf86Sp572gJCFb4qq5/sD4CzTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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