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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ca068e569512deb787f1ed3fb00f5067ea4e6bb67acd81a39500f5bb43bde0' 
  AND token = 'i14ARJC8qYnP3y1bWFsLfVu7VA3yCWrdHUEZfznnW40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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