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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd7cb8ed6ac5f63d39ae27838a21eda13894a901308b986c49c50db5ff80296' 
  AND token = 'pkmM24Ai0UAU66iyvHqP2Ef9f+rmnlV6JTQvgYO6GyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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