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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bac12b6eba73263fe8ca52ded8cc1eb4d93b71e0e97fbcb8d4d91b1d8c215b7' 
  AND token = 'YQISie+PQBFRwlLN5zeBr3CWy7TwLeqklO35SHnbihE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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