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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc964740c4ed2d43cd04b89a056eac6ec042a754dc7323b5df4e3a55548cf6dc' 
  AND token = '1DFeNQyA98/Hfu5BE0N3wbKIBWRIPnHAFXNWbull5fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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