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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12dba50096c4fb725960462c63f01bc822dbf8ee21eba0b431b5802c64af83d0' 
  AND token = 'rf0B76Gw//KFVUvKvWW5aInZGiAw8vKuOsaHC4IV2Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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