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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8d2564bb526e4e6fe35757835ee1b86903e6ee6088f988bf47a9f4e96ac820' 
  AND token = '7GCVCCvGuv2lmmPtSR+W34wocw8WnSp6si1TDMAmriQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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