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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cc3c86d6f75a6823d3a3ec1d5e2b0f0af25c70876c22e4c3a59cfc285dcb22' 
  AND token = 'HUZOkAMPPPXNJNkCLt7InfpZlx5iuHbkBJL1T10dsvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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