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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c23ed84b8a55cdf68981546574b9459cf3ea01cc49a9606d693d4754bb5256' 
  AND token = '1F5xz0DcXsI/8ZVyig2i61Du83x6EtwUfUUO4Nn4wB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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