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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83863c993b16dc9b9a1c54a46c2cc3ee68d936d2a631ba7657676df35d8aece7' 
  AND token = 'JGjYgzg07ivrn0OEyuLySweHxSD2Sj55ZTeGQUz1yIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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