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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5820fe56ac1ecb0f0e8685a465bb9423ff3f2492bfed4847b26a16f50a9e1a' 
  AND token = 'zMCFgUkTby9+hdLnR06xLAyDyEYDaBPzgazyFAn7hRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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