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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b2bb582d01b01661da76994659d06ce3f5e1a309a0f9e538e0ef31e6933dc4' 
  AND token = 'tMjaiNuEZklZSj5ha50vhX4Ivu+WpWj8MbRDeOvXWfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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