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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ea5e49fbfc93ce6614067615bcdb9830fa5b944be792eb2cacecf813e93844' 
  AND token = 'QxWK/ME3ZWz7OE2WnUSqLw36bF1Yzrr8pNYVEUXX2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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