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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e5c52b34f4ba131a37189abe835bb9f938520303ef73ecdd6f7d26be5743d1' 
  AND token = 'xEJ+zVIRo17a8bAe0OCiMqsXm8tarNatZC+ErQfx/mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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