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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be9a2a2b9534f20d676d17cbf0d0d7785019fe815888d947d2ee5082bd79e2f' 
  AND token = 'Dnku3cxIqf4zz/OO9IosuzqsaQkOyfnn3EpGQ8BSNYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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