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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a13fa4d83673ed25ce618f98c60f2b3d2beee2328b115f71c66118d451ced5d' 
  AND token = 'sbA5isg+gn8u/VfYsgB4npXjNlp6F82b0pMFjRA/Bhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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