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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2410f2a3e709ca2008ec1b0b1cecd4361d0cad77df1348dc28c6027bb692b7' 
  AND token = 'wNMI9+BgMFv1trun72y/7lIgLOS6h9fxotcBlSB7szo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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