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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2006fd16a7983f28c17c5dbad117e03ebfdc8167369c81d57c6b0e6a966b94' 
  AND token = '3QbRtec3/QcU0lqpx/lGOan1XZANx9/kLWJH1Ecv7l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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