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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75f27c577cc74c6ad12ddee3fee48e1ea30963ab57c177957f38d432b82b7d8' 
  AND token = 'M1tPF1fSiRbcPfk++eHHORA5DHpTJcIqqTXibci46D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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