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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ce8c7345b1e4f0c9580e00967b4b9bc5c44b4dbe39301e6ab1798d24a55339' 
  AND token = 'KjBcE3pqc1esiCTrFsDmG7NiUWLneU9txX54qTaB648=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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