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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629d1c257a166d01bbace01a273834b3b81ccfa372ea7ca294f366f073f7958c' 
  AND token = '/icDeXxTS+gJu59fgkU3iIOf5FGFsj/NmsaPr1O2fR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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