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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee2e1e767ab9e27b8e6c6959fd2ae1623d1b7c8e3f9cae644df3939eec4dc11' 
  AND token = 'Fgkrkxw7rMP0899KvmXosEJzyy8nODRQ79fIPerCMuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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