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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c9b4bbd4b266f3efb6d2f89f6f9dcd2d5ff20284ae79e90eb7289e105f3a1e' 
  AND token = '8o+QdNJMJk7cnsocYslOgFvoaD2gQkqklQ9U1iLaoPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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