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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd7738e75cfc8fa13e03bab758891a158f7ce825d8a232b3ecf73c47ecfba13' 
  AND token = 'Z6nWWQx6gerVJ/GDC2SwvkqZ6DOEqncMhX3uqM0I0bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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