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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfeb2a6c1fd5e1ae0aea3a4f29d3d0f93dccb62af221673ab48c5f9dac55b6b5' 
  AND token = 'H+IK7lE4te1za09gI7nc+bolb4c413SJEC9JnqsJPLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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