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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd135ab34a41dd0b8d8f8100407f742dffae5b5f7ac1924df7d57569abb144bd2' 
  AND token = 'yxrQlPJ2ZSE59lDM7VBsCE2B3UWQyGkd8ThqAt35GBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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