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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b3dba440bf61119eb539beff9698bfa6f71c4a4aaed4839b420aeb84c984b3' 
  AND token = '7yvyn604kW8Ls3JRlwYnRH35m8WA2NxfYRLcaXHALyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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