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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62585325125985ef9a05d4ee590fd557b63547a134449fdd81339bd32ca7324f' 
  AND token = '5bl3JychY/PG+yADDSz5Ea/BKoB7kra1VJJVZ6/pzek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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