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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6b1b71225da1374d3262d86625b24a1ab49b424bbe0708133cf8efa5f305ec' 
  AND token = 'SP9IwlHHO56qPdQM2a5IL3YJ7AEGW7pyKq640PlBu6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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