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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c3bdd9514a3de01957cef30752c50f4dd52bb8bcffd9959febe10c850c5bca' 
  AND token = 'EYD0heJsIDBa7nwAOVhBhL4CHF8csrvl5DNanCbDiVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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