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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3764e04847ba562b94cbd95873002f6380c40d98817bc44a23d10656e2ebe3be' 
  AND token = 'Li7kARyFoZftIR+o4MA+f2/gOp2HTd+TvBgMu25MjPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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