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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2368e7c9da1cad3b0d82466d909ede1aacecb0717909c7f7d3d8688cae9769' 
  AND token = 'b4tdfUWuW7YElVyS813yWc2Vz21tWVZyIo2CZZy0zjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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