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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db68418e5e61c418962e63f4f6a59bd66990e15f5a0712ebd3aeb31fa054b21c' 
  AND token = 'tdncL+aQluPxhYo9xQ0Y4k/kSXDE8YiqH4/3ywT6658=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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