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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ed63bd750d779a4a7c2791e0a790b2ff19f08da34415771d50028295b34ab9' 
  AND token = 'ACsnROCQ0oJJdRosYCU2F73n68S+Xnbr4lMwIvdZv3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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