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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a5b7b8e85154fd7f9399b2622a1c8e9277f7fc74d84b4f99ebbfc38709bd51' 
  AND token = 'k42ojB4gWUH4Qf2fefowo8kNXCBvJ1ILPMK9fXWziTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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