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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271790fbc15fbcaaeb0da2fa41340ea6d4df944cccec31ccc69f018b9f024929' 
  AND token = '6R98aOthfVmwj0k+9Ywwo/FIAvoVqWFY0IfqPz9tgHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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