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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70626f771af01cc1ebc20b0f3cc620d78ab4d34aa098c7d3b58ffd5c8d415d87' 
  AND token = '3t0HFvCDt7gfXpaTmAD4PdnlmsphNeHWHTqQIHLYxe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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