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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767e6ceab78eb9189392d77029401bf8a5ca5db16e06e73cc6cbeb69ba24ae4a' 
  AND token = '1A6WU+VY47awhV5wW2JsDsakkLUHiO+DQDL2O4BXDGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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