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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb595d60007d074c46b758659f02882e4122d7ef7a522d9d7b548f51d746238' 
  AND token = 'Nui2AtjeRxx4BWgzorlWMj04thuOSgbOcKEfql1uT8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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