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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62616c6435e82b68fa7d68a3bbd13ade19acfd7b091eeedef685f76a88c1c553' 
  AND token = 'FNjqXRS3GQWpkYqdfJLmm/2BoYbEZhHbrtAaLnFx3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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