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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a513db1ed9a7ddd5fb652d1f3b0f4a54ce10a0ce6988c70ba0c76cdb88b2a1' 
  AND token = 'WLC68CvUMJURnjvsuaN/6pj1KQ/K05JkQqCVXIlUXRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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