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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7917f3743b08b1a4027e9bc799b33aca039580d05e66dd72b251094fad384937' 
  AND token = 'mUt3W+3qH/NsoOeCX9K3GhtPiYUPHP+sYO/B7i9AohA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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