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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066c0d12321b54fbf487439eed54f847efbada8c8b28ea0c4643b5bba1e6f728' 
  AND token = 'ohJwyw3dGmZtTVwvxuseytYPUuXIxR4AV1B8XmvJnbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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