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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf18bac37250de1e7a52bb8e5917cf8501fbd9bf70276fd771f82100d1214d6' 
  AND token = 'JBrVzmDpI4bMVAjKvmAY/jK74VzURB8ewQ302L470U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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