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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db877654998ac8b43f753ededa40ae1df2ff734e0535e05a3813d3e6716829fa' 
  AND token = '4bTiCeJ4JJ2JCmxPT/V6GxdUzOnGSfCbgSmcoW6rzH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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