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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badbbf022d749e819c4e40970c2ed205aab4994f05eea55404af8bc561a7cc3a' 
  AND token = 'cRWLGL2YcrCVkwVmWvK9IIO4K6lr4590Swx3xIHNwCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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