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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598d7d8ab70087b1b6b479e04ae445432c73a8a7b32e792361659d2912c5c69a' 
  AND token = 'adkeNo+l4/tAdW/4P5KhQ724bOQ5B54jJEjVhU6qw6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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