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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd2966208d2ff9c9c5cbdacf38b601cf87485fbf4c716188fb312c622df7a78' 
  AND token = 'tYqdko4DkMNV5+odEG7lfdg5wV4uFnepk+1AfM1bhxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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