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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23c458d56b1d628d4fddfb727ad13001dbedacc708d521b930d40d5517dd2aa' 
  AND token = '0lQJvff4wyAh0wc5zPcV3VGtTl9oD92O09aQ3hW7Pag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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