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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbc7554adb9ece87586e725c59f04d2e33bb4e6762c6b3669930fdaba8d0844' 
  AND token = 'tbStrbQR/bL2uoPHog5VHMRCZkt8w+fMpK2F9vj0c2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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