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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195307cc83bddd2e8edc87d2b54c22e87594a5a1f3f3815c74a7ea1055b38bc9' 
  AND token = '7XhRAvevB9tvvA9gZ739J5SbTJT+JfOQpbOfHWp6oEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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