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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54d5c931c5ec243531063a20b0a99832495238c7373fea08fad7fadfc09932b' 
  AND token = 'eVeyGeFc3U/ygasUHJb3kzBd25Z8uYo6q/80E9yrHPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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