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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ad0631f9f576dad4c2cff7db471ec1bf0d18fafc76557461ad76fe055f0a42' 
  AND token = 'jiZVuiarsE1ZXIRY2tdPl5gzcPolpkdUSfVriQw+rMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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