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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a062c76b68a9f8ef8e09f7fe0b36e8c142291d41c00da86e72c8f3f9cc233cb0' 
  AND token = '6bd5KP1PQIrdlDW2D4oH12AuF1u+6LeHwHz9JmzOWuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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