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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf663d160d09b399586a3b3e32e96d4c66dd9050c62c34fdd02b812c0248b90' 
  AND token = 'Bl6ytrY0AKPFU82n20TlKtwn3mEtlJDD8z2/GKz2lP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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