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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f38fcf2c29055514dd1f452c3356d1dea71fb6e4cfceb4e6ba90a923c7b2eeb' 
  AND token = '1CZlcfxzPmByQcCDsADZAo7wl+kpprPS4CNOT8QUSSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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