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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526e688e6f2de992525df03dafcd771033eb31528bc0e650776b48bef19ec8fd' 
  AND token = '2ESULLTT93whbf11bFsSynUD9uRTnbUACALe1Sn+Dus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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