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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d4cdb80fcac44b8bafa9c6bc4b8dce14f30802dfeaae3eff6c65daeda69d36' 
  AND token = '95KoK1eh7HQHp8OZCs/sa5kxIiV+Hyl0EcPcVyFSgPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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