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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2703d6ad669ec705cef38b804feca60f9b4202869af785fcbd5291cd90a8ebb4' 
  AND token = 'm6CbfwmqudiN3Ft3YwBEekzfnVH0Os8govS24y3NLBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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